C172 The Improved Version of Voidflying Knife

Chen Zhishan returned to his room to rest. Loong Zitian found Xuanyuan Feng to study the internal formation of the sword.

"Zitian, I'm afraid there is a limit to the number of swords in this sword. This further explained the mysteriousness of this magic formation. If we can master this formation, we might be able to master the way to control the sword. " Xuanyuan Feng said.

"Fifth grandfather